Figure 5.
L1 lineages have frequently recruited novel 5′UTR sequences. This scenario was inferred from the phylogenetic tree in Figure 2. An arrow indicates the acquisition of a new 5′UTR. The 5′UTR sequences are drawn proportionally to their size. As the L1PA14 family is nested within the L1PA13A family (data not shown), it is likely that the modern type of 5′UTR was probably recruited independently by the L1PA14 and L1PA13B families.
